轴向偏移量对水下摩擦塞焊接头质量的影响

Influences of axial offset distance on the weld quality in underwater friction taper plug welding

采用天津大学自主研发的水下摩擦塞焊设备,进行了不同塞孔与塞棒轴向偏移量(即不同同轴度)对接头质量影响的试验。对接头底部拐角处形貌进行了观察分析,对比分析了不同塞孔与塞棒设计尺寸和不同塞孔与塞棒轴向偏移量得到的接头质量。结果表明,在端部接触面积及塞孔与塞棒间隙较小的A类塞孔与塞棒形状尺寸下,不同偏移量均无法获得较高的接头质量,塞棒偏移后间隙较大的一侧缺陷更加严重。在无偏移的情况下,使用端部接触面积及塞孔与塞棒间隙较大的B类塞孔与塞棒的接头底部拐角处存在微小缺陷,接头质量总体较好。主轴的对中位置精度应控制在±0.5 mm以内。

The friction taper plug welding( FTPW) device designed by Tianjin University was used to study the influence of axial offset distance of plug from the center of hole( namely different concentricity) on the weld quality. The morphology of the bottom corner of the weld joints was observed and analyzed,and the joint quality obtained by different geometry and concentricity of the hole and plug was compared and analyzed. The results showed that no qualified welded joints could be obtained at all by different axial offset distances under the condition of the geometry A with less contact area and narrower gap,and that the defects of one side with larger gap were worse after the plug being offset. For the geometry B with larger contact area and larger gap,there were minor defects and the overall quality was okay when the offset distance was zero. The concentricity between plug and hole should be controlled within ± 0. 5 mm.